Normalizing furnace



Jam 4, 1938. c. B. HOAK NORMALIZING FURNACE 3 Sheets-Sheet 1 Filed Oct. 1, 1936 Q Q d Inventor Attorneys Jan. 4, 1938. c. B. HOAK NORMALIZING FURNACE l, 1936 5 Sheets-Sheet 2 Filed 001;.

Inventor JZZLZTa/z M By m Attorneys Jan. 4, 1938'. c. B. HOAK NORMALIZING FURNACE s Shee ts-Sheet s Filed Oct.

1 llllll II 3 u Inventor Pncnca Jan. 4, 1938 a 2,104,518

UNITED IISTATES PATENT, OFFICE s p 2,104,518 a s mNORMALIZING munch Clarence B. Hock, Steubenville, o i Application October 1, 1936, scim no. 103,595

2 Claims. (Cl. 266-3) 'The present invention appertains to new and in these tubes by maintaining the valve closed or useful improvements in means for treating sheet partly closed. Less heat is of course retained if steel and like material to prevent oxidation and the valves are opened to allow a substantially full the formation of scales thereon as it is heated draft.

5 and cooled in the furnace. Inverted L-shaped tubes 2ialternate with the 5 The principal object of the present invention tubes l6 adjacent the heating compartment [4, is to provide a furnace of the character stated the vertical portions of which depend to connect for normalizing sheet metal wherein the sheet with the manifold 22 which is provided with a metal is forced to pass through a non-explosive motor driven suction fan 23 at one end thereof.

10 gas as it is heated and then gradually cooled so The upper ends of the tubes 2| extend through as to prevent any form of oxidation. the rear side of the furnace wall and are open Another important object of the invention is to the atmosphere. Obviously the heat of the to provide a normalizing furnace wherein the chamber H can be accurately gauged by regusheet metal can be gradually cooled to any varylating the heat valves 20 at the upper ends of 1 ing degree desired. the tubes l6. 5

Various other important objects and advan- Around the chamber I5 are the L-shaped air tages of the invention will become apparent to tubes 25-26 which are arranged in the same the reader of the following specification, manner as the tubes i6--2l around the chamber In the drawings:- I4. However, the tubes 25-26 are both used for Figure 1 represents a side elevational view of a the lower ends of the tubes 5 communicating 20 the furnace. with the manifold 21 which has the motor driven Figure 2 is a vertical sectional view on line suction fan 28 at one end thereof, while the 2-2 of Figure 3. upper ends of the tubes 26 pass thru the top of Figure 3 represents a longitudinal vertical secthe furnace d c n ect to the manifold 29 tional viewthrough the furnace, which has-the motor driven suction fan 30 at 25 Figure 4 is a fragmentary side elevational view One e d t e eo disclosing one of the air outlet ports with the Obviously Passed through the tube 5 can shutter in partly open position a be regulated by the pivotal shutters 3| on the Referring to the drawings wherein like numerppe nds thereof.

30 als designate like partsit can be seen that the At each end f the furnace s located a W e 30 furnace is elongated and of any extent desired, box 31 which y eentaih W te 01' Some other the same preferably being of oblong shape and Suitable liquid n ed in which are located having the wall construction 5 consisting of the the rollers 33 and 34 at t e lower end of the corliner 6, covering 1 and the insulating filler 8. responding neck C The metallic Strip 35 85 Reference characters A-B represent the end t0 be treated Passes Over e oller 36 on the 35 wells of the furnace through which the neck porupper edge of e bOX 3 and also between the t 3-1 of th end drum 9 extends This rollers 33-34 in the liquid, and then over a d 9 is of rectangular cross section roller 31 located in the horizontal portions of tends longitudinally through the furnace abuteach of the necks 0 ting the endsthereof at its end and having a re- The interior of the drum 9 s charged with a duced intermediate. portion In following the edge Prot ct ve gas through the inlet tube 38, WhlCh' portions of the opening through the partition Ii gas Passes along the metallle Sheet In a direction defining an opening [3 between the heating opposite to the direction of travel of the sheet. chamber' H of the drum and the cooling chamr keeping s a in circulation a return p p h |5 v 39 extends from the neck D, toward the opposite 45 Around the heating chamber 14 are t t end of the furnace and beneath the furnace to the L-shaped heating t b [5 1 th l w d porother end thereof to communicate with the fan tion of which is located a regular fuel or gas 1101151118 40 in which the Suction fan 4| p es. burner IT. The conductor pipe 42 extends from the housing The upper ends of these tubes 16 extend, I into the 9 at the compartment l5. Thus 50 through the top of the furnace and connect to he s ch s p d to e drum s pt n 9, manifold pipe [8 which has a, motor driven circulation constantly. A water jacket 43 is prosuction fan ii at one end thereof. The upper vided around the return pipe 39 and has a water portions of the tubes i6 are provided with butterinlet pipe 44 and a water outlet pipe 45. fly valves 20 therein so that heat can be retained While the foregoingspeciflcation sets forth the 55 the drum, a protective gas inlet for the drum and means for circulating the gas through the drum. said drum being divided into ,a heating chamber and a cooling chamber through both 01 which the work passes, said heating chamber being provided with tubes extending adjacent the same, certain of said tubes having cold air passing therethrough and burners positioned in the remaining tubes for producing hot air.

2. A furnace oi the character described comprising an elongated hollow structure, a (mum extending longitudinally in the hollow structure, a work traveling passageway through the drum, a protective gas inlet for the drum and means for circulating the gas through the drum, said drum being divided into a heating chamber and a cooling chamber through both of which the workpasses, said heating chamber being'provided with tubes extending adjacent the same, certain of said tubes having cold air passing therethrough and burners positioned in the remaining tubes for producing hot air, and cold air tubes extending adjacent the cooling chamber of the drum.

CIARENCE B. -HOAK. 

